US4671569A - Resilient back-up mechanism for vehicle seat structure - Google Patents

Resilient back-up mechanism for vehicle seat structure Download PDF

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Publication number
US4671569A
US4671569A US06/776,951 US77695185A US4671569A US 4671569 A US4671569 A US 4671569A US 77695185 A US77695185 A US 77695185A US 4671569 A US4671569 A US 4671569A
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US
United States
Prior art keywords
seat
seat back
spring
resilient
back frame
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/776,951
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English (en)
Inventor
Kenichi Kazaoka
Hiroshi Okazaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aisin Corp
Original Assignee
Aisin Seiki Co Ltd
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Filing date
Publication date
Priority claimed from JP19402384A external-priority patent/JPS6173616A/ja
Priority claimed from JP19402284A external-priority patent/JPS6173615A/ja
Application filed by Aisin Seiki Co Ltd filed Critical Aisin Seiki Co Ltd
Assigned to AISIN SEIKI KABUSHIKI KAISHA, 2-1, ASAHI-MACHI,KARIYA-SHI, AICHI-KEN, JAPAN, A CORP. OF JAPAN reassignment AISIN SEIKI KABUSHIKI KAISHA, 2-1, ASAHI-MACHI,KARIYA-SHI, AICHI-KEN, JAPAN, A CORP. OF JAPAN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KAZAOKA, KENICHI, OKAZAKI, HIROSHI
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Publication of US4671569A publication Critical patent/US4671569A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/64—Back-rests or cushions
    • B60N2/66—Lumbar supports

Definitions

  • the present invention relates to a resilient back-up mechanism for a vehicle seat structure. More particularly, the present invention pertains to an adjustable resilient back-up mechanism for supporting the waist portion of a passenger sitting on the seat.
  • the known types include a direct drive system as shown by the Japanese Patent Publication No. 56-10051, a cam drive type as disclosed by the Japanese Patent Publication No. 55-49 and a screw drive type as disclosed by the Japanese utility model publication 51-20802.
  • the direct drive is of a mechanism having a back-up member located at a portion corresponding to the waist portion of the passenger sitting on the seat.
  • An actuating lever is provided for moving the back-up member to thereby adjust the back-up force.
  • This mechanism is however disadvantageous in that a large actuating force is required when the adjustment is carried out while the passenger's weight is applied on the seat back.
  • the mechanism is disadvantageous in that a complicated ratchet mechanism must be provided for holding the parts of the mechanism in desired positions.
  • the ratchet mechanism is mounted on the seat back frame. However, it is a troublesome work to install the ratchet mechanism during a seat assembling process.
  • the cam drive type has a cam which is actuated by an actuating lever to thereby adjust the position of the back-up member.
  • This type is also disadvantageous in that a large actuating force is required when an adjustment is made while the weight of the passenger is applied on the seat back.
  • Another disadvantage of this type is that a preassembled adjusting mechanism is mounted by means of bolts on brackets which are provided on the seat back frame, so that the mounting procedure is very troublesome.
  • the screw drive type includes a screw-nut mechanism for converting a rotation of a handle member to an axial movement. This mechanism is inconvenient to use because a lot of rotation is required to obtain a desired adjustment. If a coarse thread is adapted to increase the adjusting speed, an increased operating force will be required.
  • Another object of the present invention is to provide an adjusting mechanism for a resilient back-up device in a vehicle seat back which is easy to mount on a seat back frame.
  • a back-up mechanism including an adjusting member mounted on the seat back frame for a swingable movement, a waist back-up member supported by the seat back frame for fore and aft movement, an adjustable spring between the adjusting member and the waist back-up member to provide a resilient support for the back-up member against a movement in a rearward direction.
  • the spring is arranged so that its axis lies on a line spaced apart from the pivot support of the back-up member on the seat back frame so that a moment is produced by the spring force for resisting a rearward movement of the back-up member, and that a swinging movement of the adjusting member causes a change in the distance between the axis of the adjusting spring and the pivot support of the back-up member whereby the resilient back-up force of the back-up member can be changed.
  • the distance between the axis of the adjusting spring and the pivot support of the back-up member may be changed together with the axial elongation of the spring.
  • brackets For mounting the adjusting members on the seat back frame, brackets may be provided. One of the brackets may have a hole for receiving a pin on one of the adjusting members and the other bracket may have a one-end open slot which is engaged with a pin on the other of the adjusting members. With this arrangement, it becomes very easy to assemble the adjusting mechanism on the seat back frame.
  • one end of the rod may be carried in a hole and the other end may be carried in a one-end open slot.
  • FIG. 1 is a perspective view of a back-up mechanism for a vehicle seat back structure in accordance with one embodiment of the present invention
  • FIG. 2 is a view as seen in the direction of the arrow I in FIG. 1;
  • FIG. 3 is a sectional view taken along the line II--II in FIG. 2;
  • FIG. 4 is an exploded perspective view of the mechanism shown in FIG. 1;
  • FIG. 5 is a perspective view similar to FIG. 1 but showing another embodiment
  • FIG. 6 is a view as seen in the direction of the arrow III in FIG. 5;
  • FIG. 7 is a sectional view taken along the line IV--IV in FIG. 6;
  • FIG. 8 is a perspective view explaining assembling steps of the structure shown in FIG. 5;
  • FIG. 9 is a perspective view showing a further embodiment of the present invention.
  • FIG. 10 is a sectional view taken substantially along the line V--V in FIG. 9;
  • FIG. 11 is a side view showing still further embodiment of the present invention.
  • FIG. 12 shows yet further embodiment of the present invention.
  • FIG. 1 particularly to FIGS. 1 through 4, there is shown one embodiment of the present invention which includes a seat back frame 1 made of a pipe member of a substantially U-shaped configuration.
  • a contour wire 2 which functions to maintain the shape of the seat cloth.
  • wave-shaped seat springs 3 Between the opposite sides of the wire 2, there extend wave-shaped seat springs 3.
  • the lower-most seat spring 3 is held at the opposite end portions on the side portions of the contour wire 2 by means of clips 5.
  • Each end 6 of the spring 3 extends through the clip 5 and secured to the side portions of the seat back frame 1.
  • the seat back frame 1 is attached at one of its side portions with a backet 7 which is welded thereto for the purpose of mounting a seat reclining mechanism (not shown).
  • the bracket 7 is of a substantially U-shaped cross-section having an inner flange 8 which is formed with a U-shaped slot 9.
  • the seat back frame 1 is attached with a second bracket 10 which is welded thereto.
  • the bracket 10 has a pin 11 at its lower portion and is formed at an intermediate portion with a slot 12 as best shown in FIG. 4.
  • adjusting members 13 and 13' which carry pins 14 and 14', respectively.
  • the adjusting member 13 is at the side where the bracket 10 is provided and the pin 14 on the adjusting member 13 is engaged with the slot 12 in the bracket 10.
  • the adjusting member 13' is adjacent to the bracket 7 and the pin 14' on the member 13' is engaged with the slot 9 in the inner flange 8 of the bracket 7.
  • the adjusting members 13 and 13' are respectively formed at the upper portions with arms 15 and 15' of inverted U-shaped configurations. The ends of the arms 15 and 15' are connected with a connecting rod 16.
  • the adjusting member 13 is formed with teeth 17 which is adapted for engagement with the pin 11 on the bracket 10.
  • An operating handle member 18 is attached to the pin 14.
  • a depressing spring member 19 having a substantially horizontal upper portion 20 and vertical portions 19a and 19b extending downwardly from the opposide ends of the horizontal portion.
  • the horizontal portion 20 of the depressing spring member 19 is positioned behind one of the seat springs 3.
  • the vertical portions 19a and 19b of the spring member 19 are formed with hooked portions 21 which are engaged with slots 23 in brackets 22 welded to the lower portion of the seat back frame 1.
  • a tension spring 24 is provided to extend between the adjusting member 13 and the corner portion between the horizontal portion 20 and the vertical portion 19a of the spring member 19.
  • a second tension spring 24 is provided to extend between the adjusting member 13' and the corner portion between the horizontal portion 20 and the vertical portion 19b of the depressing spring member 19.
  • FIGS. 1 through 3 the parts are shown in "soft" positions.
  • FIG. 2 it will be noted that the axis of the tension spring 24 passing through points a and b also passes through the fulcrum point c of the depressing spring member 19 so that the depressing spring member 19 does not receive any force urging it toward the seat spring 3.
  • this position if a passenger sits on the seat and applies his weight on the seat back, there will be produced a deflection in the seat spring 3 whereby the depressing spring member 19 is forced to incline rearward to, for example, a position shown by a phantom line d in FIG. 2.
  • the axis of the spring 24 is then inclined to a line passing through the points a and b' applying the spring member 19 with a counter-clockwise moment with a moment arm l1. It will be noted that in this position the deflection of the spring 24 is relatively small and the moment arm l1 is also small. Therefore, the support force produced by the spring mechanism is relatively weak.
  • the operating effort can be very small and can be substantially the same both in cases where the adjustment is made from the "soft” to the “hard” and from the “hard” to the “soft”.
  • the spring 24 is expanded to increase the spring force.
  • the axis of the spring 24 moves from the line ab' to the line a'b', the axis of the spring 24 moves toward the axis of the pin 14. Therefore, there will be no increase in the moment produced by the force of the spring 24 about the axis of the pin 24 to resist the actuation of the operating handle 18.
  • the adjusting members 13 and 13' connected together by the connecting rod 16 as shown in FIG. 4 are put into position by having the pin 14 on the member 13 inserted into the slot 12 in the bracket 10 and then having the pin 14' on the member 13' engaged with the slot 9 in the bracket 8. Then a circlip E is fitted to the pin 14 to hold the pin 14 from moving in the axial direction as shown in FIG. 3. Thereafter, the back-up spring 19 is installed in position by having the hook portions 21 engaged with the slots 23 in the brackets 22 and springs 24 and 24' are then installed between the arms 15 and 15' of the adjusting members 13 and 13' and the corner portions of the spring 19. It will therefore be understood that the assembling procedure is very simple.
  • the adjusting springs 24 and 24' are in advance connected to the adjusting members 13 and 13' and the corner portions of the back-up spring 19 before the hook portions 21 of the spring 19 are engaged with the slots 23 in the brackets 22.
  • the pin 14' may be formed with an end flange so that the pin 14' can be fitted to the bracket 8 without any noticeable axial play.
  • FIGS. 5, 6, 7 and 8 showing another example of the present invention
  • the structure shown therein is different from the previous embodiment in that the adjusting spring 24 is provided only one side and a waist back-up plate 36 is provided.
  • the bracket 7 secured to one side portion of the seat back frame 1 is formed with an inner flange 8 having a hole 25.
  • the bracket 10 secured to the other side portion of the seat back frame 1 has a downwardly extending portion 26 which is formed with a downwardly opening slot 27 as shown in FIG. 6.
  • the adjusting member 13 is provided only at the side where the bracket 10 is located so that the connecting rod 16 as used in the previous embodiment is omitted.
  • the bracket 10 in this embodiment is not of an inverted U-shape as in the previous embodiment but is formed at the upper end with an inwardly extending flange 28.
  • a back-up mechanism 29 which includes the aforementioned back-up plate 36 and a crank rod having a central portion 34 and end portions 32 and 32'.
  • the central portion 34 of the crank rod is secured by, for example, welding to the back-up plate.
  • the end portion 32 of the crank rod is passed through and welded to one end of a lever 30.
  • the lever 30 extends upward from the end portion 32 of the crank rod and has a hole 31 at the upper end.
  • the adjusting spring 24 is engaged at one end with the flange 28 on the bracket 10 and at the other end with the hole 31 of the lever 30.
  • the end portion 32 of the crank rod extends beyond the lever 30 as shown by 33 in FIG. 7 and is engaged with the slot 27 in the downward extension 26 of the bracket 10.
  • a clip 35 is attached to the outer end of the portion 33 of the end portion 32 of the crank rod to restrict axial movements of the crank rod.
  • the other end portion 32' is inserted into the hole 25 in the flange 8 of the bracket 7.
  • the adjustment of the hardness can be made in this embodiment as in the previous embodiment.
  • the adjusting member 13 can be rotated about the axis of the pin 14 in, for example, the counter clockwise direction in the plane of FIG. 6 from the "soft" position to the "hard” position.
  • the upper end of the adjusting spring 24 is moved from the position a to the position a'.
  • the lever 30 is rotated clockwise about the axis c of the end portion 32 of the crank rod so that the lower end of the spring 24 is moved from the point b to the point b'.
  • the axis of the spring 24 is shifted away from the axis c producing a resisting moment having an increased moment arm l2.
  • the adjusting spring 24 is attached to the adjusting member 13 and the lever 30 as shown in FIG. 8 and the pin 14 on the adjusting member 13 is then engaged with the slot 12 in the bracket 10. Thereafter, the clip E is fitted to the pin 14 and the end portion 32' is inserted into the hole 25 in the flange 8. The other end portion 32 is then engaged with the downwardly opened slot 27.
  • the adjusting members 13 and 13' are connected together by the connecting rod 16 and the axial movement is restricted either by the clip E on the pin 14 or by the end flange on the pin 14'.
  • the crank rod is restricted from axial movement by the clip 35 provided on one end portion 32.
  • FIGS. 9 and 10 there is shown a third embodiment of the present invention which is different from the previous embodiments in that the back-up structure is mounted in a canti-lever fashion.
  • a bracket 37 which carries a base plate 38 of a substantially U-shaped configuration, which is secured to the bracket 37 at the base 39 of the U-shape.
  • the base plate 38 has a pair of arms 40 and 40' extending perpendicularly from the base 39 and is mounted with the arms extending laterally inward of the seat back frame 1.
  • the base plate 38 carries an adjusting member 41 which includes a pair of bell crank levers 42 and 42' pivotably carried respectively by the arms 40 and 40' through pins 44 and 44'.
  • the bell crank levers 42 and 42' are each formed at one end integrally with a plate 43.
  • the bell crank levers 42 and 42' rotatably carry at their other ends a shaft 45 which is formed with a diametrically extending internally threaded hole 46.
  • a handle 47 having a receptacle hole 48 to which an actuating shaft 49 is fitted.
  • the shaft 49 is supported rotatably by the base 39 of the base plate 38 and formed with an externally threaded portion 50 which is engaged with the internally threaded hole 46 in the shaft 45. It will therefore be understood that by rotating the handle 47, it is possible to turn the bell crank levers 42 and 42' about the pins 44 and 44'.
  • a back-up lever 51 is mounted at an intermediate portion thereof on end portions of the arms 40 and 40' by means of a pin 52.
  • the lever 51 carries at one end a back-up plate 53 which is pivotably mounted on the lever 51 by means of a pin 54.
  • the lever 51 is formed with a hole 55 to which an adjusting spring 24 is engaged at one end. The other end of the spring 24 is engaged with the plate 43 of the adjusting member 41.
  • FIG. 10 the parts are shown in positions corresponding to the "soft" condition of the adjusting mechanism.
  • the handle 47 When the handle 47 is rotated to rotate the shaft 49, the shaft 45 threadably engaged with the shaft 49 is moved rightward so that the adjusting member 41 is turned clockwise about the pin 44.
  • one end of the adjusting spring 24 is moved from the position a to the position a'.
  • the back-up lever 51 When a load is incurred on the back-up plate 53 to move it reaward, the back-up lever 51 is turned counter clockwise about the pin 52 so that the other end of the spring 24 is moved from the position b to the position b'.
  • the moment arm l2 for the spring force about the pin 52 is increased than that l1 in the "soft" position.
  • FIG. 11 shows a further embodiment which is substantially the same as the first embodiment.
  • the adjusting member 13 is provided with a hook 56 beneath the pin 14 in lieu of the arm 15 for engagement with the adjusting spring 24.
  • the pin 11 engages the lower edge of the adjusting member 13 at the right hand portion, however, in this embodiment, the pin 11 engages the left hand portion.
  • a spring 19 is provided as in the first embodiment, however, the spring 19 is engaged with a rotation stopper 58 provided on the seat back frame 1.
  • the direction of actuation of the handle is opposite to that in the first embodiment.
  • the resiliency of the spring 19 can be utilized by fixing the lower portion of the spring by means of the stopper 58.
  • FIG. 12 there is shown a further embodiment which is similar to the third embodiment.
  • the back-up lever is connected at a slot 59 with one end 60a of a band 60, the other end of the band 60 being connected through a pin 54 with a back-up plate.
  • the operations are the same as those in the third embodiment.

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  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Seats For Vehicles (AREA)
US06/776,951 1984-09-18 1985-09-17 Resilient back-up mechanism for vehicle seat structure Expired - Fee Related US4671569A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP59-194022 1984-09-18
JP19402384A JPS6173616A (ja) 1984-09-18 1984-09-18 自動車用シ−トのランバ−サポ−ト装置
JP19402284A JPS6173615A (ja) 1984-09-18 1984-09-18 自動車用シ−トのランバ−サポ−ト装置
JP59-194023 1984-09-18

Publications (1)

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US4671569A true US4671569A (en) 1987-06-09

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Application Number Title Priority Date Filing Date
US06/776,951 Expired - Fee Related US4671569A (en) 1984-09-18 1985-09-17 Resilient back-up mechanism for vehicle seat structure

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US (1) US4671569A (enrdf_load_stackoverflow)
DE (1) DE3533324A1 (enrdf_load_stackoverflow)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5026117A (en) * 1987-11-10 1991-06-25 Steelcase Inc. Controller for seating and the like
US5042876A (en) * 1987-11-10 1991-08-27 Steelcase Inc. Controller for seating and the like
US5215350A (en) * 1991-03-20 1993-06-01 Tachi-S Co., Ltd. Lumbar support device
US5697672A (en) * 1994-01-13 1997-12-16 Pullmaflex U.K. Ltd. Improvements in and relating to seat arrangements providing adjustable support
US5957533A (en) * 1996-12-03 1999-09-28 Gallardo; David Cotero Articulated reclining backrest with lumbar support
US20030085600A1 (en) * 2001-10-22 2003-05-08 Masatoshi Mori Lumbar support device
US6616229B2 (en) * 1999-12-06 2003-09-09 Faurecia Autositze Gmbh & Co. Kg Car seat
US20040075320A1 (en) * 1993-06-17 2004-04-22 Schukra Geratebau Ag Device for adjusting a flexible support element of a backrest
US6814407B2 (en) 2002-06-05 2004-11-09 L & P Property Management Company Single actuator four-way power lumbar
US20050093355A1 (en) * 2003-11-03 2005-05-05 Faurecia Autositze Gmbh & Co. Kg Automobile seat
US20050168036A1 (en) * 2003-12-08 2005-08-04 Johnson Controls Technology Company Easy lift mechanism for vehicle seats
US20060091705A1 (en) * 2002-11-08 2006-05-04 Johnson Controls Technology Company Seat cushion presenter device for folding seat
US20110004371A1 (en) * 2009-07-06 2011-01-06 L & P Property Management Company Adjustable Foundation for a Seating Unit
US7997650B2 (en) 2008-02-22 2011-08-16 Schukra Of North America Constant pressure retreating lumbar system
US9004597B2 (en) 2012-09-20 2015-04-14 Steelcase Inc. Chair back mechanism and control assembly
WO2021184536A1 (zh) * 2020-03-19 2021-09-23 徐庆 一种可以调节软硬坐感的座垫结构
US11304528B2 (en) 2012-09-20 2022-04-19 Steelcase Inc. Chair assembly with upholstery covering

Families Citing this family (3)

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JPH052128Y2 (enrdf_load_stackoverflow) * 1986-03-31 1993-01-20
JPH02147008A (ja) * 1988-11-29 1990-06-06 Nissan Shatai Co Ltd ランバサポート装置
CN115054082B (zh) * 2022-06-30 2023-05-12 东莞市艾慕寝室用品有限公司 一种基于大数据分析的多级减震降噪调节系统

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US4148522A (en) * 1977-05-25 1979-04-10 Nissan Motor Company, Limited Seat backrest with adjustable lumbar supporter
US4159847A (en) * 1976-06-07 1979-07-03 Nissan Motor Company, Limited Seat for a motor vehicle or the like
US4162807A (en) * 1976-11-01 1979-07-31 Aisin Seiki Kabushiki Kaisha Lumbar support regulating apparatus

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US4019777A (en) * 1975-02-06 1977-04-26 Aisin Seiki Kabushiki Kaisha Lumbar support regulating apparatus
US4159847A (en) * 1976-06-07 1979-07-03 Nissan Motor Company, Limited Seat for a motor vehicle or the like
US4162807A (en) * 1976-11-01 1979-07-31 Aisin Seiki Kabushiki Kaisha Lumbar support regulating apparatus
US4148522A (en) * 1977-05-25 1979-04-10 Nissan Motor Company, Limited Seat backrest with adjustable lumbar supporter

Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5042876A (en) * 1987-11-10 1991-08-27 Steelcase Inc. Controller for seating and the like
US5026117A (en) * 1987-11-10 1991-06-25 Steelcase Inc. Controller for seating and the like
US5215350A (en) * 1991-03-20 1993-06-01 Tachi-S Co., Ltd. Lumbar support device
US6883867B2 (en) 1993-06-17 2005-04-26 Schukra Geratebau Ag Device for adjusting a flexible support element of a backrest
US20040075320A1 (en) * 1993-06-17 2004-04-22 Schukra Geratebau Ag Device for adjusting a flexible support element of a backrest
US5697672A (en) * 1994-01-13 1997-12-16 Pullmaflex U.K. Ltd. Improvements in and relating to seat arrangements providing adjustable support
US5957533A (en) * 1996-12-03 1999-09-28 Gallardo; David Cotero Articulated reclining backrest with lumbar support
US6616229B2 (en) * 1999-12-06 2003-09-09 Faurecia Autositze Gmbh & Co. Kg Car seat
US20030085600A1 (en) * 2001-10-22 2003-05-08 Masatoshi Mori Lumbar support device
US6814407B2 (en) 2002-06-05 2004-11-09 L & P Property Management Company Single actuator four-way power lumbar
US20060091705A1 (en) * 2002-11-08 2006-05-04 Johnson Controls Technology Company Seat cushion presenter device for folding seat
US7311358B2 (en) 2002-11-08 2007-12-25 Johnson Controls Technology Company Seat cushion presenter device for folding seat
US20050093355A1 (en) * 2003-11-03 2005-05-05 Faurecia Autositze Gmbh & Co. Kg Automobile seat
US7086700B2 (en) 2003-11-03 2006-08-08 Faurecia Autositze Gmbh & Co. Kg Automobile seat
US20050168036A1 (en) * 2003-12-08 2005-08-04 Johnson Controls Technology Company Easy lift mechanism for vehicle seats
US7448685B2 (en) 2003-12-08 2008-11-11 Frederick Wilkinson Easy lift mechanism for vehicle seats
US7997650B2 (en) 2008-02-22 2011-08-16 Schukra Of North America Constant pressure retreating lumbar system
US20110004371A1 (en) * 2009-07-06 2011-01-06 L & P Property Management Company Adjustable Foundation for a Seating Unit
US9022474B2 (en) 2009-07-06 2015-05-05 L&P Property Management Company Adjustable foundation for a seating unit
US9004597B2 (en) 2012-09-20 2015-04-14 Steelcase Inc. Chair back mechanism and control assembly
US9451826B2 (en) 2012-09-20 2016-09-27 Steelcase Inc. Chair assembly
US9022476B2 (en) 2012-09-20 2015-05-05 Steelcase Inc. Control assembly for chair
US9027998B2 (en) 2012-09-20 2015-05-12 Steelcase Inc. Chair assembly
US9027999B2 (en) 2012-09-20 2015-05-12 Steelcase Inc. Control assembly for chair
US9027997B2 (en) 2012-09-20 2015-05-12 Steelcasel Inc. Chair assembly
US9049935B2 (en) 2012-09-20 2015-06-09 Steelcase Inc. Control assembly for chair
USD742677S1 (en) 2012-09-20 2015-11-10 Steelcase Inc. Chair
USD742676S1 (en) 2012-09-20 2015-11-10 Steelcase Inc. Chair
US9010859B2 (en) 2012-09-20 2015-04-21 Steelcase Inc. Chair assembly
US9462888B2 (en) 2012-09-20 2016-10-11 Steelcase Inc. Control assembly for chair
US9492013B2 (en) 2012-09-20 2016-11-15 Steelcase Inc. Chair back mechanism and control assembly
US9526339B2 (en) 2012-09-20 2016-12-27 Steelcase Inc. Control assembly for chair
US9844267B2 (en) 2012-09-20 2017-12-19 Steelcase Inc. Chair back mechanism and control assembly
US9861201B2 (en) 2012-09-20 2018-01-09 Steelcase, Inc. Chair assembly
US9918552B2 (en) 2012-09-20 2018-03-20 Steelcase Inc. Control assembly for chair
US10206507B2 (en) 2012-09-20 2019-02-19 Steelcase Inc. Control assembly for chair
US11304528B2 (en) 2012-09-20 2022-04-19 Steelcase Inc. Chair assembly with upholstery covering
WO2021184536A1 (zh) * 2020-03-19 2021-09-23 徐庆 一种可以调节软硬坐感的座垫结构
US11999279B2 (en) 2020-03-19 2024-06-04 Qing Xu Seat cushion structure capable of adjusting softness and hardness

Also Published As

Publication number Publication date
DE3533324C2 (enrdf_load_stackoverflow) 1990-10-04
DE3533324A1 (de) 1986-03-27

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